4b.) 
4c.) 
5b.) 
Solution Steps:
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and 
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and 
:
:
and 
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and 
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× 
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and 
: 
. Multiplication can be transformed into difference of squares using the rule: 
:
:
to expand 
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and 
:
. Multiplication can be transformed into difference of squares using the rule: 
and 
:
:
and 
:
Please help me with 4/a, b, c and 5/b
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Answers: 2
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